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STREAMS Programming Guide
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Part I Application Programming Interface

1.  Overview of STREAMS

2.  STREAMS Application-Level Components

3.  STREAMS Application-Level Mechanisms

4.  Application Access to the STREAMS Driver and Module Interfaces

5.  STREAMS Administration

6.  Pipes and Queues

Part II Kernel Interface

7.  STREAMS Framework - Kernel Level

Overview of Streams in Kernel Space

Stream Head

Kernel-Level Messages

Message Types

Message Structure

Message Linkage

Queued Messages

Shared Data

Sending and Receiving Messages

Data Alignment

Message Queues and Message Priority

Message Queues

queue() Structure

Using Queue Information

Entry Points

open Routine

close Routine

put Procedure

Queue service Procedure

qband Structure

Using qband Information

Message Processing Procedures

Flow Control in Service Procedures

8.  STREAMS Kernel-Level Mechanisms

9.  STREAMS Drivers

10.  STREAMS Modules

11.  Configuring STREAMS Drivers and Modules

12.  Multithreaded STREAMS

13.  STREAMS Multiplex Drivers

Part III Advanced Topics

14.  Debugging STREAMS-based Applications

Part IV Appendixes

A.  Message Types

B.  Kernel Utility Interface Summary

C.  STREAMS-Based Terminal Subsystem




Chapter 7

STREAMS Framework – Kernel Level

Because the STREAMS subsystem of UNIX® provides a framework on which communications services can be built, it is often called the STREAMS framework. This framework consists of the stream head and a series of utilities (put, putnext), kernel structures (mblk, dblk), and linkages (queues) that facilitate the interconnections between modules, drivers, and basic system calls. This chapter describes the STREAMS components from the kernel developer's perspective.